Display screen or portion thereof with a graphical user interface of an electronic device



The sole FIGURE is a front view of a display screen or portion thereofwith a graphical user interface of an electronic device, showing our newdesign.

In the FIGURE, the outermost broken lines illustrate a display screen orportion thereof and form no part of the claimed design. The remainingbroken lines illustrate portions of the graphical user interface thatform no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface of an electronic device, as shown anddescribed.